98631557 has 2 divisors, whose sum is σ = 98631558. Its totient is φ = 98631556.

The previous prime is 98631499. The next prime is 98631587. The reversal of 98631557 is 75513689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49547521 + 49084036 = 7039^2 + 7006^2 .

It is an emirp because it is prime and its reverse (75513689) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98631557 - 2⁶ = 98631493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98631587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49315778 + 49315779.

It is an arithmetic number, because the mean of its divisors is an integer number (49315779).

Almost surely, 2^98631557 is an apocalyptic number.

It is an amenable number.

98631557 is a deficient number, since it is larger than the sum of its proper divisors (1).

98631557 is an equidigital number, since it uses as much as digits as its factorization.

98631557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The square root of 98631557 is about 9931.3421550161. The cubic root of 98631557 is about 462.0319015595.

The spelling of 98631557 in words is "ninety-eight million, six hundred thirty-one thousand, five hundred fifty-seven".